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libpayload: usb: Add interval attribute to endpoints

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Read bInterval from endpoint descriptors and store it in our endpoint_t
struct. The interval is encoded dependently on the device' speed and the
endpoint's type. Therefore, it will be normalized to the binary logarithm
of the number of microframes, i.e.
  t = 125us * 2^interval

The interval attribute will be used in the xHCI driver.

Original-Change-Id: I65a8eda6145faf34666800789f0292e640a8141b
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: http://review.coreboot.org/3449
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
(cherry picked from commit aee44fa37d)

BUG=chrome-os-partner:21969
TEST=None

Change-Id: Ic42ad3c193390d5838b563346604b1ef9f385b52
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/168094
This commit is contained in:
Nico Huber 2013-06-06 10:20:35 +02:00 • committed by chrome-internal-fetch
commit db98cca0ed
2 changed files with 46 additions and 0 deletions
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2
payloads/libpayload/include/usb/usb.h
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@ -91,6 +91,8 @@ typedef struct {
int toggle;
int maxpacketsize;
endpoint_type type;
int interval; /* expressed as binary logarithm of the number
of microframes (i.e. t = 125us * 2^interval) */
} endpoint_t;
enum { FULL_SPEED = 0, LOW_SPEED = 1, HIGH_SPEED = 2, SUPER_SPEED = 3 };